A word like ‘Huh?’ —used when one has not caught what someone just said—appears to be universal: it is found to have very similar form and function in languages across the globe. ... this little word, along with others that function in similar ways (e.g., ‘Sorry?’ ‘What?’) is an indispensible tool in human communication. Without such words we would be unable to signal when we have problems with hearing or understanding what was said. Because conversation moves along so quickly, if we did not have reliable ways of signaling trouble, we would constantly fail to stay ‘on the same page’ in social interaction.

This book provides a practical introduction to Digital Signal Processing. Covering a wide range of topics, including linear systems, discrete fourier transforms, fast fourier transforms, digital filters, this book is an ideal introductory text for those new to DSP, and an excellent reference for more experienced users.

近代全球化效益深信不疑者，很難想像為何「美好世界」無以為繼，甚至催生出英國甘冒經濟大幅衰退風險，決心退歐等事件。但從著名經濟學者羅德里克（Dani Rodrik）於二○○○年提出的「世界政經運作三元悖論」（political trilemma of world economy）觀點看來，當前的國際政治亂象反倒像是一個遲來的必然，並無多大驚人之處。何謂世界政經運作三元悖論？簡單地說，就是「全球經濟整合」、「國家主權」，以及「高度直接參與的民主政治體制」，三者無法同時兼得。

Apache ZooKeeper is a distributed coordination service which eases the development of distributed applications. It’s used by projects like Apache Hadoop, HBase and others for different use cases like leader election, configuration management, node coordination, server lease management, etc.

Nodes within ZooKeeper cluster store their data in a shared hierarchal namespace which is similar to a standard file system or a tree data structure.

In this article, we’ll explore how to use Java API of Apache Zookeeper to store, update and delete information stored within ZooKeeper.

JShell provides an interactive shell for quickly prototyping, debugging, and learning Java and Java APIs, all without the need for a public static void main or the need to compile your code before executing it. ... JShell is extremely good at providing immediate feedback.